# coding=utf-8
base_lst = [
'1.1, 2.2, 3.3',
'1.11, 2.22, 3.33',
'1.111, 2.222, 3.333',
'1.1111, 2.2222, 3.3333',
]

lst = [map(float, i.split(',')) for i in base_lst]
print lst
# lst = [i for i in tmp for tmp in lst]
lst = [i for tmp in lst for i in tmp]
print lst
